470 



HENBY A. ROWLAND 



Continued. 



We can discuss the comparison of these thermometers in two ways; 

 either by direct comparison at the points we desire, or by the repre- 

 sentation of the differences by a formula. 



Joule's result in 1850 was referred to water at about 14 C., and in 

 1878 to water at 16 -5 C. Taking intervals in the above table of from 



